Are mines, pumps, and storages different %'s when destroyed?

So just now I noticed something wierd in my war raid. Using my clean up crew for the 2nd star, i started dropping archers. Little by little they start destroying outside buildings. It gets down to the last few, ones on a gold mine, one on a elix pump, one on the lab, and two on a gold mine. Gold mine gets destroyed and it gives me 1%, elix pump gets destroyed and its 2%, lab gets destroyed and gives me 1%, and storage gets destroyed and it was 1%. Just never noticed this before. Not making any deal about it, just curious if anyone else has seen this before. Pics below.

http://i.imgur.com/6bmKdbR.jpg

http://i.imgur.com/Bp6sm4r.jpg

http://i.imgur.com/iGjzOfn.jpg

http://i.imgur.com/Z18rfDy.jpg

http://i.imgur.com/0vYYPTt.jpg

Percentages are rounded by the number of buildings destroyed over the total number of buildings.

For example, say the defender has a total of 81 buildings:

36 buildings destroyed = 36/81 = 44.44% = Shows up as 44%
37 buildings destroyed = 37/81 = 45.67% = Shows up as 46%
38 buildings destroyed = 38/81 = 46.91% = Shows up as 47%
39 buildings destroyed = 39/81 = 48.14% = Shows up as 48%
40 buildings destroyed = 40/81 = 49.38% = Shows up as 49%
41 buildings destroyed = 41/81 = 50.62% = Shows up as 51%

So yea, sometimes the percentage will go up by 1%, sometimes 2% depending on how it's rounded. Also, are you sure that the Archer that was targeting the Laboratory didn't take out the Builder Hut next to it soon after?

Just saw. After it destroyed the lab it hit the builder hut for 48%. Was just curious why the elix pump got 2%. Got it now

Thank you for taking the time to explain all of that.

Attacking a TH10 for 50%, I notice it goes up 1% each from 47 -> 48 -> 49 -> 50

Quite frustrating when it reach 49% :facepalm: